Using Keyboard Events
Most Windows Forms programs process keyboard input by handling the keyboard events. This topic provides an overview of the keyboard events, including details on when to use each event and the data that is supplied for each event. Also see Event Handlers Overview (Windows Forms), Events Overview (Windows Forms).
Windows Forms provides two events that occur when a user presses a keyboard key and one event when a user releases a keyboard key:
The KeyDown event occurs once
The KeyPress event, which can occur multiple times when a user holds down the same key.
The KeyUp event occurs once when a user releases a key.
When a user presses a key, Windows Forms determines which event to raise based on whether the keyboard message specifies a character key or a physical key. For more information about character and physical keys, see How Keyboard Input Works.
The following table describes the three keyboard events.
This event is raised when a user presses a physical key.
The handler for KeyDown receives:
This event is raised when the key or keys pressed result in a character. For example, a user presses SHIFT and the lowercase "a" keys, which result in a capital letter "A" character.
This event is raised when a user releases a physical key.
The handler for KeyUp receives: